Synthesis of onio‐, dionio‐, and trionio‐substituted phosphines; the nucleophilic behavior of DBN and DBU toward main group electrophiles

Abstract 1,5‐Diazabicyclo[4.3.0]non‐5‐ene (DBN) and 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) react with chloro‐ and dichloro‐phosphines leading to onio‐ and dionio‐substituted phosphines. Similarly, onio‐substituted silicon and tin derivatives are prepared; they are used as onio‐substituent transfer reagents in the synthesis of a trionio‐substituted phosphine.